![]() Restrictive policy : no traffic from any IP address or interface is allowed, only traffic that is explicitly allowed in the firewall will be allowed.įor security, we should always configure the firewall policy as “restrictive”, in fact, many default firewall softwares are already configured with this policy, even professional routers and firewalls, that is, we have an implicit rule at the end that indicates a “deny all”, as is the case with Cisco routers or firewall-oriented operating systems like pfSense. ![]() Permissive policy : any traffic from any IP and interface is allowed, only what is explicitly blocked in the firewall will be blocked.Firewalls can be configured in two different ways: Look closely at the logs of certain traffic Deny traffic implicitly (default)įirewalls allow two types of policies when it comes to allowing or denying traffic, configuring a restrictive policy with the network traffic that comes and goes is something totally fundamental to adequately protect the computers and also the network.Document all the rules in the “description” field.Check that the rules are still in force on the network.Optimize the created rules and order them.
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